S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Slipping / Shaking / Wiggling 722.4 Transmission

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Old Sep 29, 2015 | 09:11 PM
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1984 300sd
Red face Slipping / Shaking / Wiggling 722.4 Transmission

I have a beloved 84 300sd with 195k on it.

The transmission was replaced before I bought it at roughly 140k, which is why its a 722.4 and not a 722.3

I have revamped all vacuum lines, checked for leaks, replaced vacuum modulator with the updated one. I replaced the fluid and filter last year. There is no sign of browning of the fluid currently.

All of a sudden the transmission has started upshifting slowing and shaking pretty bad on every up shift. Shaking is worst in lower gears, less worse on 3-4, but definitely noticeable. Downshifts are fine, reverse is fine. Doesn't slip out of gear at all.

I would normally think B2 piston but the car drives just fine when I floor it all the time except for this massive shaking. It does shift early I think. It's usually in 4th gear by 25mph.

Any thoughts? Is it the clutch plates? How long can I drive it like without doing any serious damage? I won't even have the $ to do the B2 replacement until next month. I haven't been driving it all which is kind of a bear cuz it was my daily driver.

Thank you all so much in advance for your replies!!
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